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disk/mbr: always use 512 byte sectors (imported changes from sources)

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This commit is contained in:
cinap_lenrek 2012-03-09 06:10:08 +01:00
parent c9d2ce7b1c
commit 1e8c6d3d41
1 changed files with 9 additions and 3 deletions
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12
sys/src/cmd/disk/mbr.c
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@ -145,10 +145,16 @@ main(int argc, char **argv)
if(disk->type == Tfloppy)
fatal("will not install mbr on floppy");
if(disk->secsize != 512)
fatal("secsize %d invalid", disk->secsize);
/*
* we need to cope with 4k-byte sectors on some newer disks.
* we're only interested in 512 bytes of mbr, so
* on 4k disks, rely on /dev/sd to read-modify-write.
*/
secsize = 512;
if(disk->secsize != secsize)
fprint(2, "%s: sector size %lld not %ld, should be okay\n",
argv0, disk->secsize, secsize);
secsize = disk->secsize;
buf = malloc(secsize*(disk->s+1));
mbr = malloc(secsize*disk->s);
if(buf == nil || mbr == nil)